Geomagnetic activity dependence of O+ in transit from the ionosphere

Details Geomagnetic activity dependence of O+ in transit from the ionosphere Geomagnetic activity dependence of O+ in transit from the ionosphere

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71.1623p&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 16, p. 1623-1629.

Physics

1

Ionospheric Outflow, Ring Current, Plasma Sheet, Plasma Transport

Scientific paper

Energetic O+ ions have important dynamic effects on the ring current. Insights into the effects of O+ on ring current dynamics have come primarily from models, not observations. Here, we discuss observations of O+ populations escaping from the ionosphere and their access to the plasma sheet and ring current. We review data establishing that a significant flux of O+ escapes the ionosphere during geomagnetically quiet intervals. We then estimate the relative magnitude of the O+ population in transit between the ionosphere and ring current during quiet intervals before geomagnetic storms. Our analysis suggests that dynamic reconfigurations of the magnetosphere during geomagnetic storms significantly alter the O+ transport paths from the ionosphere to the ring current. During these reconfigurations some of the pre-existing, quiet time, in-transit O+ populations are captured on magnetic field lines leading to the ring current. The prompt appearance of this O+ population in the ring current could modify the evolution of the ring current in the storm growth phase. Our analysis suggests that the consequences of an activity-dependent O+ transport path to the ring current should be systematically investigated.

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